darkTheme property
Implementation
static set darkTheme(bool value) {
_isDarkTheme = value;
primary = _isDarkTheme ? light : Colors.black;
secondary = _isDarkTheme ? dark : light;
backgroundColor = _isDarkTheme ? dark : secondary;
borderColor = _isDarkTheme ? Colors.grey[700] : Colors.grey[300];
fillColor = borderColor;
}